US3274574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backhitching tape control
Assignee: International Business Machines Corp
•
Filing: 1962-12-24
•
Granted: 1966-09-20
•
Expires: 1982-12-24
Abstract
No abstract record available.
Inventors
- 👤 Earl W Miller
- 👤 John W Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:00
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1816
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A SYSTEM FOR BACKHITCHING A DIGITAL TAPE DATA BLOCK RECORDED ON A TAPE IN A TAPE DRIVE COMPRISING: MEANS FOR SENSING THE OCCURRENCE OF A WRITE COMMAND WHILE SAID TAPE DRIVE IS IN READ STATUS TO PROVIDE A BACKHITCH SIGNAL, MEANS FOR DRIVING SAID TAPE IN A BACKWARD DIRECTION IN RESPONSE TO SAID BACKHITCH SIGNAL, AND MEANS FOR REVERSING THE DIRECTION OF MOVEMENT OF SAID TAPE IN RESPONSE TO SENSING AN END OF A PRIOR BLOCK.
Claim 2
Independent Claim
76 words
A SYSTEM FOR BACKHITCHING A DIGITAL TAPE DATA BLOCK RECORDED ON A TAPE IN A TAPE DRIVE COMPRISING: MEANS FOR SENSING THE OCCURRENCE OF A WRITE COMMAND WHILE SAID TAPE DRIVE IS IN READ STATUS TO PROVIDE A BACKHITCH SIGNAL, MEANS FOR DRIVING SAID TAPE IN A BACKWARD DIRECTION IN RESPONSE TO SAID BACKHITCH SIGNAL, AND MEANS FOR REVERSING THE DIRECTION OF MOVEMENT OF SAID TAPE IN RESPONSE TO SENSING AN END OF A PRIOR BLOCK.
References Cited (Backward Citations)
US2975407A
Cited
US3136465A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |